112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/*------------------------------------------------------------------------*/
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/* A Sample Code of User Provided OS Dependent Functions for FatFs */
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/*------------------------------------------------------------------------*/
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#include "hal.h"
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#include "ff.h"
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#if FF_USE_LFN == 3 /* Use dynamic memory allocation */
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/*------------------------------------------------------------------------*/
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/* Allocate/Free a Memory Block */
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/*------------------------------------------------------------------------*/
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#include <stdlib.h> /* with POSIX API */
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void* ff_memalloc ( /* Returns pointer to the allocated memory block (null if not enough core) */
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UINT msize /* Number of bytes to allocate */
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)
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{
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return malloc((size_t)msize); /* Allocate a new memory block */
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}
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void ff_memfree (
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void* mblock /* Pointer to the memory block to free (no effect if null) */
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)
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{
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free(mblock); /* Free the memory block */
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}
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#endif
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#if FF_FS_REENTRANT /* Mutal exclusion */
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/*------------------------------------------------------------------------*/
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/* Definitions of Mutex */
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/*------------------------------------------------------------------------*/
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static semaphore_t ff_sem[FF_VOLUMES + 1];
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/*------------------------------------------------------------------------*/
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/* Create a Mutex */
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/*------------------------------------------------------------------------*/
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/* This function is called in f_mount function to create a new mutex
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/ or semaphore for the volume. When a 0 is returned, the f_mount function
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/ fails with FR_INT_ERR.
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*/
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int ff_mutex_create ( /* Returns 1:Function succeeded or 0:Could not create the mutex */
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int vol /* Mutex ID: Volume mutex (0 to FF_VOLUMES - 1) or system mutex (FF_VOLUMES) */
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)
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{
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semaphore_t *sobj = &ff_sem[vol];
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chSemObjectInit(sobj, 1);
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return 1;
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}
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/*------------------------------------------------------------------------*/
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/* Delete a Mutex */
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/*------------------------------------------------------------------------*/
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/* This function is called in f_mount function to delete a mutex or
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/ semaphore of the volume created with ff_mutex_create function.
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*/
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void ff_mutex_delete ( /* Returns 1:Function succeeded or 0:Could not delete due to an error */
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int vol /* Mutex ID: Volume mutex (0 to FF_VOLUMES - 1) or system mutex (FF_VOLUMES) */
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)
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{
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semaphore_t *sobj = &ff_sem[vol];
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chSemReset(sobj, 0);
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}
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/*------------------------------------------------------------------------*/
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/* Request a Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on enter file functions to lock the volume.
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/ When a 0 is returned, the file function fails with FR_TIMEOUT.
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*/
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int ff_mutex_take ( /* Returns 1:Succeeded or 0:Timeout */
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int vol /* Mutex ID: Volume mutex (0 to FF_VOLUMES - 1) or system mutex (FF_VOLUMES) */
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)
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{
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semaphore_t *sobj = &ff_sem[vol];
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msg_t msg = chSemWaitTimeout(sobj, (systime_t)FF_FS_TIMEOUT);
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return msg == MSG_OK;
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}
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/*------------------------------------------------------------------------*/
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/* Release a Grant to Access the Volume */
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/*------------------------------------------------------------------------*/
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/* This function is called on leave file functions to unlock the volume.
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*/
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void ff_mutex_give (
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int vol /* Mutex ID: Volume mutex (0 to FF_VOLUMES - 1) or system mutex (FF_VOLUMES) */
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)
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{
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semaphore_t *sobj = &ff_sem[vol];
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chSemSignal(sobj);
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}
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#endif /* FF_FS_REENTRANT */
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